A rhizomorph is commonly associated with which genus?

Rhizomorphs are specialized structures that function in the growth and exploration of substrates, commonly associated with certain types of fungi. In the context of the given options, Poria is particularly notable for forming rhizomorphs, which help the fungus in efficiently transporting nutrients and water, as well as colonizing new areas. This characteristic of Poria makes it well-adapted to environments where it needs to spread rapidly through its substrate, such as wood.

The other genera listed—Trichoderma, Aspergillus, and Penicillium—are not typically characterized by the formation of rhizomorphs. Instead, they have other structures or reproductive strategies that suit their ecological niches. For instance, Trichoderma is known for its role in biocontrol and its rapid growth but does not exhibit rhizomorph formation like Poria does. Aspergillus and Penicillium primarily produce conidia (asexual spores) and do not develop rhizomorphs.

Thus, the association of rhizomorphs with the genus Poria emphasizes its unique adaptations and ecological role within its environment.